Characterization of fullerenes and fullerene derivatives by small-angle neutron scattering and transmission measurements
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
- Departments of Chemistry and Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)
- Division of Radiation Biology, Case Western Reserve University, Ohio 44106-4942 (United States)
Small-angle neutron scattering (SANS) has been shown to be an appropriate technique for the structural characterization of fullerenes in solvents with strong SANS contrast (e.g., CS{sub 2}). The dimensions of C{sub 60}, C{sub 70}, and C{sub 84} moieties derived from neutron scattering via standard Guinier analysis are typically {approximately}8{percent} higher than calculated from the atomic coordinates. However, when the SANS data are fitted to an appropriate model form factor, there is good agreement between the measured and calculated values and the results are independent of the fullerene concentration within the experimental errors. Deuterated solvents (e.g., toluene-d{sub 8}) have a high scattering length density (SLD), which is close to that of C{sub 60}, C{sub 70}, and C{sub 84}, so there is virtually no SANS contrast with the solvent and these particles are practically {open_quotes}invisible{close_quotes} in such media. Conversely, the negative scattering length of hydrogen lowers the SLD, giving strong contrast with toluene-d{sub 8} and SANS may therefore be used to study the size and shapes of buckyballs modified with H{sup 1}-containing materials. These may also be studied via neutron transmission measurements and this paper describes complementary studies of cyclohexane-substituted fullerenes. {copyright} {ital 1999 American Institute of Physics.}
- OSTI ID:
- 362673
- Journal Information:
- Journal of Chemical Physics, Vol. 111, Issue 10; Other Information: PBD: Sep 1999
- Country of Publication:
- United States
- Language:
- English
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